First bunch of graphs. Major drop-off above 10k? - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 2 Old 02-22-11, 02:12 AM Thread Starter
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problemaddict
 
Join Date: Mar 2009
Location: 19440
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First bunch of graphs. Major drop-off above 10k?

Hello all,

Got REW hooked up this evening. My setup is a Denon AVR2800 feeding two different sets of mains. A pair of Energy Excel bookshelves and a pair of BES/Bertagni planars (NXT style, dipole) and a DIY sonotube sub (Apex Jr. INF10 driver) being fed by a Mackie amp. I'm using a SB X-Fi external sound card and the RS 33-4050 SPL meter on a tripod at my listening position.

None of the measurements look all that great, but that's to be expected in an untreated room w/ hardwood floors. My main concern is the major drop-off above 8k. Is that accurate, or a typical symptom of the RS 33-4050 SPL meter?

Here's the graphs:

The sub only (125hz XO).


So, the 78hz dip is a room node, right? Nothing to do there but move the sub around in the room? And what's going on at 45-50hz? Is that the port tuning?

Here's the Energy Excels. First alone, next w/ the sub





The BES have both Mid and Hi knobs on them. I played around w/ them and took some measurements at different settings.

This is the BES + sub w/ the mid knob at about 5% and the high knob at about 52%



And with mid - 50% and high - 100%



And the BES same as above, no sub



And just for giggles I turned both the Energy and BES on together. With and without sub:





So, to reiterate, my main concern is the massive drop-off above 8k. Any insight there?

Thanks!!!
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post #2 of 2 Old 02-22-11, 12:16 PM
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Join Date: Sep 2007
Location: Edmonton, Alberta, Can
Posts: 15,054
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Re: First bunch of graphs. Major drop-off above 10k?

Yup, The RS meter is very lousy above 6K The Galaxy CM140 dose better until about 12K If you wnat accurate readings to 20K you need to get a Behringer ECM8000 but that requires a phantom power source.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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bertagni , bes , energy , excel , graphs , initial , rew

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